print-target-feature 0.1.0

CARGO_CFG_TARGET_FEATURE="..."
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use std::env;
use std::io::{self, Write};
use std::process;

fn main() {
    let cfg = env::var_os("CARGO_CFG_TARGET_FEATURE").unwrap_or_default();
    let _ = writeln!(io::stderr(), "CARGO_CFG_TARGET_FEATURE={:?}", cfg);
    process::exit(1);
}